만5세 소프트웨어 수업에 나타난 교육적 의미 탐색

홍찬의,Hong, Chan-Ui 중소기업융합학회 2020 융합정보논문지 Vol.10 No.9

본 연구의 목적은 만5세 유아들에게 컴퓨팅 사고력 중심 소프트웨어 수업을 실행하고, 수업에 참여한 유아와 수업을 실행한 교사에게 각각 어떠한 교육적 의미가 있는지 분석하여 바람직한 유아기 소프트웨어 교육을 위한 시사점을 밝혀보기 위함이었다. 이를 위해 서울시에 소재한 유치원 두 곳에서, 만5세 유아 50명을 대상으로 총 10개의 수업을 진행하고 수집된 자료를 질적으로 분석하였다. 연구결과, 소프트웨어 수업에서 유아에게 나타난 교육적 의미는 선행 경험에서 문제를 발견하기, 스토리로 시뮬레이션 과정에 다가가기, 소프트웨어 기기를 통해 흥미와 성취감 느끼기였으며, 교사에게 나타난 교육적 의미는 절차적 사고과정을 지원하는 발문하기, 사고과정을 구체적 경험으로 이끌기, 집단 활동과 개별 활동 사이에서 적절하게 오고가기였다. 연구를 통해 발견된 교육적 의미는 바람직한 유아기 소프트웨어 교육을 위한 다양한 시사점을 주었으며, 향후에는 컴퓨팅 사고력 중심 유아 소프트웨어 교육의 효과성 연구가 이루어져야 할 것이다. The purpose of this study is to conduct computational thinking-based software education for a 5-year-old, and to analyze educational meanings. For the study, a total of 10 activities were applied for 50 children at two kindergartens located in Seoul and the collected data were analyzed qualitatively. As a result of the study, the educational meaning that founded to young children in software classes was finding problems in prior experiences, approaching the simulation process with stories, and feeling of interest and achievement through software devices. The educational meanings that founded to the teacher were to ask questions to support the procedural thinking process, to lead the thought process to concrete experiences, and to move between group activities and individual activities appropriately. In the future, research on the effectiveness of computational thinking-based software education should be conducted.

각종(各種) 근관확대기구(根管擴大器具)에 의(依)한 근관형성(根管形成) 후(後) 근단부(根端部) 근관면(根管面)의 형태(形態)에 관(關)한 실험적(實驗的) 연구(硏究)

홍찬의,Hong, Chan-Ui 대한치과보존학회 1981 Restorative Dentistry & Endodontics Vol.7 No.1

The purpose of this study is to compare the shape of the apical regions of root canals after instrumentation by various enlarging instruments. 120 extracted, single-rooted human teeth were seperated into 4 experimental groups. Each group provided 30 teeth for experimental use. Group 1 root canals instrumented by the hand-operated Reamer. Group 2 root canals instrumented by the hand-operated H-file. Group 3 root canals instrumented by the hand-operated K-file. Group 4 root canals instrumented by the automated Giromatic file. The results were as follows: 1. The degree of the roundness of the apical regions of root canal walls: 1) Hand-operated instruments were superior to the automated Giromatic file. 2) The Reamer was the most effective instrument among hand-operated instruments 3) There was little difference between the H-file and the K-file. 2. The degree of the smoothness of the apical regions of root canal walls: 1) Root canal walls instrumented by the hand-operated Reamer, H-file and, K-file were generally smooth, and there was little difference among them. 2) Root canal walls instrumented by the automated Giromatic file showed many irregular canal walls. 3. The existance of organic debris in the apical regions of root canals: All organic debris is not removed from root canals, and there was little difference between hand-operated instruments and the automated Giromatic instrument in removing organic debris.

완효성 비료의 시비량이 수국의 생육에 미치는 영향

홍찬의(Chan-Ui Hong),장재빈(Jae-Bin Jang),김종인(Jong-In Kim),이유리(Yu-Ri Lee),김회택(Hoy-Taek Kim),강종구(Jong-Goo Kang) 한국원예학회 2022 한국원예학회 학술발표요지 Vol.2022 No.11

Crack Tooth Syndrome의 처치법

홍찬의,Hong, Chan-Ui 대한치과의사협회 1997 대한치과의사협회지 Vol.35 No.12

완효성 비료의 시비량이 수국의 생육에 미치는 영향

홍찬의(Chan-Ui Hong),장재빈(Jae-Bin Jang),김종인(Jong-In Kim),이유리(Yu-Ri Lee),김회택(Hoy-Taek Kim),강종구(Jong-Goo Kang) 한국원예학회 2022 한국원예학회 학술발표요지 Vol.2022 No.11

급성 치수염 발수 또는 보존의 판정

홍찬의,Hong, Chan-Ui 대한치과의사협회 1990 대한치과의사협회지 Vol.28 No.6

상아질 표면처리가 글라스 아이오노머 시멘트의 변연누출에 미치는 영향에 관한 연구

조정희,홍찬의,신동훈,Cho, Jung-Hee,Hong, Chan-Ui,Shin, Dong-Hoon 대한치과보존학회 1992 Restorative Dentistry & Endodontics Vol.17 No.1

The purpose of this study was to evaluate the effect of the dentin pretreatment on the marginal leakage of a glassionomer cement. 1n this study, 60 molars with sound and healthy crown portion were used. The dentin surface of these teeth were exposed and polished with 600 grit silicon carbide paper. Square - shaped cavities were prepared on the flattened dentin surfaces and these were divided into 4 groups according to the dentin pretreatment procedures. Group I : Dentin pretreatment with distilled water as a control group. Group II : Dentin pretreatment with 5% sodium hypochlorite solution. Group III : Dentin pretreatment with Ketac conditioner. Group IV : Dentin pretreatment with 40% polyacrylic acid. The degrees of dye penetration in the cavity walls were assessed using a stereoscope at ${\times}40$ magnification according to the maximum dye penetration. The results were analyzed by using Mann - Whitney U test. The results were as follows : 1. All groups showed varying depth of dye penetration. 2. Distilled water group showed the most severe marginal leakage when compared with the other groups(P<0.05). 3. 40% polyacrylic acid group showed the least amount of marginal leakage compared with the other groups (P<0.05). 4. There were significant differences between Goup I(distilled water) and Group IV (40% polyacrylic acid)(P<0.05), but there were no significant differences among Group I(distilled water), Group II(sodium hypochlorite), Group III(Ketac conditioner) (P>0.05).

Caridex^TM Caries Removal System이 우식상아질 제거에 미치는 영향

김현선,홍찬의,Kim, Hyeon-Seon,Hong, Chan-Ui 대한치과보존학회 1990 Restorative Dentistry & Endodontics Vol.15 No.1

In order to determine if GK-101E(N-monochloro-DL-2-aminobutyrate) solution was effective in the removal of carious dentin, this study was conducted on 75 extracted human carious teeth. GK-101E solution was compared in effectiveness to saline solution.75 extracted human carious teeth were randomly assigned to two groups accordingly : (1) 50 teeth were treated with GK-101E solution : and (2) 25 teeth were treated with saline solution. Teeth in each group were divided into the medium or medium-hard consistency. Treatment consisted of directing the pulsating stream of each coded test solution utilizing the Caridex$^{TM}$ Caries Removal System against the carious surface for 4 mimutes. One operator treated all teeth with corded solution, and four investigators scored on the treated teeth based on visual examination and tactile evaluation with a dental explorer in conjunction with staining method with Caries Detector$^{TM}$ The results were as follows : 1. All groups showed various effect of carious dentin removal. 2. GK-101E solution was statistically superior to physiologic saline solution in the removal of carious dentin, regardless of carious consistency. 3. GK-101E solution in the medium-hard consistency was statistically superior to that in the medium consistency in the caries removal(p=0.001). 4. Saline solution in the medium consistency was equivalent to that in the medium-hard consistency in caries removal(p>0.1).

전자근관장 측정기의 정확도에 관한 연구

김회정,홍찬의,Kim, Hee-Jung,Hong, Chan-Ui 대한치과보존학회 1996 Restorative Dentistry & Endodontics Vol.21 No.1

It is necessary to measure the length of a root canal in order to attain a satisfactory prognosis after root canal therapy. There are several methods for determining root canal length, such as tactile sensation by the dental practitioner, the utilization of x-ray film, and electronic root canal measurement. Among these, the electrical measurement methods, in which the impedence between the oral mucous membrane and periodontal membrane is determined, have advantages of simplicity and accuracy. During root canal treatment, the root canal contains a solution of high electrical conductivity such as pus, blood, sodium hypochlorite and so on. Recently a new electronic root canal measurement device of frequency-dependent type has been developed, which is capable of measuring the length of root canal under moist conditions. Endex and Root ZX, which are frequency-dependent type, were evaluated for accuracy of measuring root canal length in vivo by stereomicroscope. The result were as follows ; 1. 82.5% of Endex and 87.5% of Root ZX measured in the range of ${\pm}0.5$ mm from the apical foramen and both showed 57.5 % in the range of 0.1 mm to 0.5 mm. 2. Endex showed significantly higher accuracy in vital teeth than nonvital teeth(p<0.05). But in case of Root ZX, there was no significant difference between vital and nonvital teeth. 3. As a result of this study, there was no significant difference in accuracy between Endex and Root ZX, and both devices showed file passes the apical foramen in more than half of the cases, and it is thought that this must be considered clinically.

NiTi Rotary Instruments에 의한 근관형성이 치근단부 근관형태에 미치는 영향

오현정,홍찬의,조용범,Oh, Hyun-Jung,Hong, Chan-Ui,Cho, Yong-Bum 대한치과보존학회 1997 Restorative Dentistry & Endodontics Vol.22 No.1

During preparation of narrow curved canals, procedural accidents such as, ledge, zipping, and transportation are frequently encountered and may lead to failure of endodontic therapy. To reduce these procedural errors and efficiently manage curved canals, various modifications in instrumentation technique and the design and flexibility of instruments have been advocated. This study compared the maintenance of the original canal curvature, cross sectional canal shape, and preparation time during instrumentation with stainless steel hand (K-Flexo) file, and nickel-titanium rotary files (Profile and Lightspeed). Thirty resin blocks with simulated curved canals of 20~25 degrees were used and divided into three groups of 10 each. In group 1, canals were instrumented using a quarter turn/pull technique with K-Flexofiles. Group 2 canals were prepared with rotary NiTi Profiles. Group 3 was prepared with rotary NiTi Lightspeed instrument. Before and after instrumentation, all canals were scanned using stereo microcope, FlexCam camera, and Photoshop 3.0 computer program. The results were as follows : 1. All groups showed some loss of canal curvature after instrumentation. Average loss of canal curvature was 8.6 degrees for K-Flexofile, 7.7 degrees for Profile, and 5.8 degrees for Lightspeed. Lightspeed exhibited significantly less curvature loss than K-Flexofile (p<0.05). 2. At the apical 1-mm level, Profile produced significantly rounder canals than Lightspeed (p<0.05). At the 3-mm level, Profile and Lightspeed exhibited significantly rounder canals than K-Flexofile (p<0.05). 3. Preparation with Lightspeed was significantly faster than Profile and K-Flexofile, and Profile was faster than K-Flexofile (p<0.05). 4. There was no significant difference in incidence of zipping between the hand K-Flexofile and rotary NiTi (Profile and Lightspeed) instruments. Most of apical canals were slightly widened near the apical foramen. As a results of this study, rotary NiTi instruments are superior to the K-Flexofile in regard to the maintenance of original canal curvature, cross-sectional shape and preparation time. But more investigations and studies should be needed to evaluate the ideal canal instrumentation.